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/*
* Copyright 2015 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef GrMeshDrawOp_DEFINED
#define GrMeshDrawOp_DEFINED
#include "GrDrawOp.h"
#include "GrGeometryProcessor.h"
#include "GrMesh.h"
#include "GrPendingProgramElement.h"
#include "SkTLList.h"
class GrOpFlushState;
/**
* Base class for mesh-drawing GrDrawOps.
*/
class GrMeshDrawOp : public GrDrawOp {
public:
class Target;
GrMeshDrawOp(uint32_t classID);
protected:
/** Helper for rendering instances using an instanced index index buffer. This class creates the
space for the vertices and flushes the draws to the GrMeshDrawOp::Target. */
class InstancedHelper {
public:
InstancedHelper() {}
/** Returns the allocated storage for the vertices. The caller should populate the vertices
before calling recordDraws(). */
void* init(Target*, GrPrimitiveType, size_t vertexStride, const GrBuffer*,
int verticesPerInstance, int indicesPerInstance, int instancesToDraw);
/** Call after init() to issue draws to the GrMeshDrawOp::Target.*/
void recordDraw(Target*, const GrGeometryProcessor*);
private:
GrMesh fMesh;
};
static const int kVerticesPerQuad = 4;
static const int kIndicesPerQuad = 6;
/** A specialization of InstanceHelper for quad rendering. */
class QuadHelper : private InstancedHelper {
public:
QuadHelper() : INHERITED() {}
/** Finds the cached quad index buffer and reserves vertex space. Returns nullptr on failure
and on success a pointer to the vertex data that the caller should populate before
calling recordDraws(). */
void* init(Target*, size_t vertexStride, int quadsToDraw);
using InstancedHelper::recordDraw;
private:
typedef InstancedHelper INHERITED;
};
private:
void onPrepare(GrOpFlushState* state) final;
void onExecute(GrOpFlushState* state) final;
virtual void onPrepareDraws(Target*) const = 0;
// A set of contiguous draws that share a draw token and primitive processor. The draws all use
// the op's pipeline. The meshes for the draw are stored in the fMeshes array and each
// Queued draw uses fMeshCnt meshes from the fMeshes array. The reason for coallescing meshes
// that share a primitive processor into a QueuedDraw is that it allows the Gpu object to setup
// the shared state once and then issue draws for each mesh.
struct QueuedDraw {
int fMeshCnt = 0;
GrPendingProgramElement<const GrGeometryProcessor> fGeometryProcessor;
};
// All draws in all the GrMeshDrawOps have implicit tokens based on the order they are enqueued
// globally across all ops. This is the offset of the first entry in fQueuedDraws.
// fQueuedDraws[i]'s token is fBaseDrawToken + i.
GrDrawOpUploadToken fBaseDrawToken;
SkSTArray<4, GrMesh> fMeshes;
SkSTArray<4, QueuedDraw, true> fQueuedDraws;
typedef GrDrawOp INHERITED;
};
#endif
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